#!/usr/bin/env python
'''
https://www.economist.com/the-world-in-brief
'''

import json
from urllib.parse import quote, urlencode

from html5_parser import parse
from lxml import etree

from calibre import replace_entities
from calibre.ebooks.BeautifulSoup import NavigableString, Tag
from calibre.ptempfile import PersistentTemporaryFile
from calibre.web.feeds.news import BasicNewsRecipe


def E(parent, name, text='', **attrs):
    ans = parent.makeelement(name, **attrs)
    ans.text = text
    parent.append(ans)
    return ans


def process_node(node, html_parent):
    ntype = node.get('type')
    if ntype == 'tag':
        c = html_parent.makeelement(node['name'])
        c.attrib.update({k: v or '' for k, v in node.get('attribs', {}).items()})
        html_parent.append(c)
        for nc in node.get('children', ()):
            process_node(nc, c)
    elif ntype == 'text':
        text = node.get('data')
        if text:
            text = replace_entities(text)
            if len(html_parent):
                t = html_parent[-1]
                t.tail = (t.tail or '') + text
            else:
                html_parent.text = (html_parent.text or '') + text


def safe_dict(data, *names):
    ans = data
    for x in names:
        ans = ans.get(x) or {}
    return ans


class JSONHasNoContent(ValueError):
    pass


def load_article_from_json(raw, root):
    # open('/t/raw.json', 'w').write(raw)
    data = json.loads(raw)
    body = root.xpath('//body')[0]
    article = E(body, 'article')
    E(article, 'div', data['flyTitle'], style='color: red; font-size:small; font-weight:bold;')
    E(article, 'h1', data['title'], title=safe_dict(data, 'url', 'canonical') or '')
    E(article, 'div', data['rubric'], style='font-style: italic; color:#202020;')
    E(article, 'div', data['byline'], style='font-style: italic; color:#202020;')
    main_image_url = safe_dict(data, 'image', 'main', 'url').get('canonical')
    if main_image_url:
        div = E(article, 'div')
        try:
            E(div, 'img', src=main_image_url)
        except Exception:
            pass
    for node in data.get('text') or ():
        process_node(node, article)


def cleanup_html_article(root):
    main = root.xpath('//main')[0]
    body = root.xpath('//body')[0]
    for child in tuple(body):
        body.remove(child)
    body.append(main)
    main.set('id', '')
    main.tag = 'article'
    for x in root.xpath('//*[@style]'):
        x.set('style', '')
    for x in root.xpath('//button'):
        x.getparent().remove(x)


def classes(classes):
    q = frozenset(classes.split(' '))
    return dict(attrs={
        'class': lambda x: x and frozenset(x.split()).intersection(q)})


def new_tag(soup, name, attrs=()):
    impl = getattr(soup, 'new_tag', None)
    if impl is not None:
        return impl(name, attrs=dict(attrs))
    return Tag(soup, name, attrs=attrs or None)


class NoArticles(Exception):
    pass


def process_url(url):
    if url.startswith('/'):
        url = 'https://www.economist.com' + url
    return url


class Espresso(BasicNewsRecipe):
    title = 'The Economist Espresso'
    language = 'en'
    __author__ = 'unkn0wn'
    encoding = 'utf-8'
    masthead_url = 'https://www.livemint.com/lm-img/dev/economist-logo-oneline.png'
    cover_url = 'https://downloadr2.apkmirror.com/wp-content/uploads/2021/10/75/615777cc6611b.png'
    description = (
        'Espresso is a rich, full-flavoured shot of daily global analysis'
        ' from the editors of The Economist to get you up to speed, fast.'
         ' Maximise your understanding of the most significant business, '
         'economic, political and cultural developments globally.'
    )

    extra_css = '''
        em { color:#202020; }
        img {display:block; margin:0 auto;}
    '''

    remove_tags = [
        dict(name=['script', 'noscript', 'title', 'iframe', 'cf_floatingcontent', 'aside', 'footer']),
        dict(attrs={'aria-label': 'Article Teaser'}),
        dict(attrs={
                'class': [
                    'dblClkTrk', 'ec-article-info', 'share_inline_header',
                    'related-items', 'main-content-container', 'ec-topic-widget',
                    'teaser', 'blog-post__bottom-panel-bottom', 'blog-post__comments-label',
                    'blog-post__foot-note', 'blog-post__sharebar', 'blog-post__bottom-panel',
                    'newsletter-form','share-links-header','teaser--wrapped', 'latest-updates-panel__container',
                    'latest-updates-panel__article-link','blog-post__section'
                ]
            }
        ),
        dict(attrs={
                'class': lambda x: x and 'blog-post__siblings-list-aside' in x.split()}),
        classes(
            'share-links-header teaser--wrapped latest-updates-panel__container'
            ' latest-updates-panel__article-link blog-post__section newsletter-form blog-post__bottom-panel'
        )
    ]
    keep_only_tags = [dict(name='article', id=lambda x: not x)]
    no_stylesheets = True
    remove_attributes = ['data-reactid', 'width', 'height']

    def get_browser(self, *args, **kwargs):
        # Needed to bypass cloudflare
        kwargs['user_agent'] = 'common_words/based'
        br = BasicNewsRecipe.get_browser(self, *args, **kwargs)
        br.addheaders += [('Accept-Language', 'en-GB,en-US;q=0.9,en;q=0.8')]
        return br

    def economist_return_index(self, ans):
        if not ans:
            raise NoArticles(
                'Could not find any articles, either the '
                'economist.com server is having trouble and you should '
                'try later or the website format has changed and the '
                'recipe needs to be updated.'
            )
        return ans

    def parse_index(self):
        query = {
            'query': 'query EspressoQuery($ref:String!){espresso:canonical(ref:$ref){...EspressoFragment __typename}}fragment EspressoFragment on Content{id type hasPart(size:1 sort:"datePublished:desc"){parts{id type rubric:description hasPart(sort:"publication.context.position:asc,datePublished:desc"){parts{...ArticleFragment __typename}__typename}__typename}__typename}__typename}fragment ArticleFragment on Content{ad{grapeshot{channels{name __typename}__typename}__typename}articleSection{internal{id title:headline __typename}__typename}audio{main{id duration(format:"seconds")source:channel{id __typename}url{canonical __typename}__typename}__typename}byline dateline dateModified datePublished dateRevised flyTitle:subheadline id image{...ImageInlineFragment ...ImageMainFragment ...ImagePromoFragment __typename}print{title:headline flyTitle:subheadline rubric:description section{id title:headline __typename}__typename}publication{id tegID title:headline flyTitle:subheadline datePublished regionsAllowed url{canonical __typename}__typename}rubric:description source:channel{id __typename}tegID text(format:"json")title:headline type url{canonical __typename}topic contentIdentity{forceAppWebview mediaType articleType __typename}__typename}fragment ImageInlineFragment on Media{inline{url{canonical __typename}width height __typename}__typename}fragment ImageMainFragment on Media{main{url{canonical __typename}width height __typename}__typename}fragment ImagePromoFragment on Media{promo{url{canonical __typename}id width height __typename}__typename}',  # noqa: E501
            'operationName': 'EspressoQuery',
            'variables': '{"ref":"/content/jakj5ed3rml75i8j0d5i74p8adf6eem4"}',
        }
        url = 'https://cp2-graphql-gateway.p.aws.economist.com/graphql?' + urlencode(query, safe='()!', quote_via=quote)
        try:
            raw = self.index_to_soup(url, raw=True)
        except Exception:
            raise ValueError('Server is not reachable, try again after some time.')
        ans = self.economist_parse_index(raw)
        return self.economist_return_index(ans)

    def economist_parse_index(self, raw):
        data = json.loads(raw)['data']['espresso']['hasPart']['parts'][0]
        self.description = data['rubric']

        ans = []
        for part in safe_dict(data, 'hasPart', 'parts'):
            title = safe_dict(part, 'title')
            pt = PersistentTemporaryFile('.html')
            pt.write(json.dumps(part).encode('utf-8'))
            pt.close()
            url = 'file:///' + pt.name
            ans.append({'title': title, 'url': url})
        return [('Espresso', ans)]

    def preprocess_html(self, soup):
        for img in soup.findAll('img', src=True):
            img['src'] = img['src'].replace('economist.com/',
                'economist.com/cdn-cgi/image/width=600,quality=80,format=auto/')
        return soup

    def populate_article_metadata(self, article, soup, first):
        article.url = soup.find('h1')['title']

    def preprocess_raw_html(self, raw, url):
        # open('/t/raw.html', 'wb').write(raw.encode('utf-8'))
        body = '<html><body><article></article></body></html>'
        root = parse(body)
        load_article_from_json(raw, root)

        for div in root.xpath('//div[@class="lazy-image"]'):
            noscript = list(div.iter('noscript'))
            if noscript and noscript[0].text:
                img = list(parse(noscript[0].text).iter('img'))
                if img:
                    p = noscript[0].getparent()
                    idx = p.index(noscript[0])
                    p.insert(idx, p.makeelement('img', src=img[0].get('src')))
                    p.remove(noscript[0])
        for x in root.xpath('//*[name()="script" or name()="style" or name()="source" or name()="meta"]'):
            x.getparent().remove(x)
        # the economist uses <small> for small caps with a custom font
        for init in root.xpath('//span[@data-caps="initial"]'):
            init.set('style', 'font-weight:bold;')
        for x in root.xpath('//small'):
            if x.text and len(x) == 0:
                x.text = x.text.upper()
                x.tag = 'span'
                x.set('style', 'font-variant: small-caps')
        for h2 in root.xpath('//h2'):
            h2.tag = 'h4'
        for x in root.xpath('//figcaption'):
            x.set('style', 'text-align:center; font-size:small;')
        for x in root.xpath('//cite'):
            x.tag = 'blockquote'
            x.set('style', 'color:#404040;')
        raw = etree.tostring(root, encoding='unicode')
        return raw

    def eco_find_image_tables(self, soup):
        for x in soup.findAll('table', align=['right', 'center']):
            if len(x.findAll('font')) in (1, 2) and len(x.findAll('img')) == 1:
                yield x

    def postprocess_html(self, soup, first):
        for img in soup.findAll('img', srcset=True):
            del img['srcset']
        for table in list(self.eco_find_image_tables(soup)):
            caption = table.find('font')
            img = table.find('img')
            div = new_tag(soup, 'div')
            div['style'] = 'text-align:left;font-size:70%'
            ns = NavigableString(self.tag_to_string(caption))
            div.insert(0, ns)
            div.insert(1, new_tag(soup, 'br'))
            del img['width']
            del img['height']
            img.extract()
            div.insert(2, img)
            table.replaceWith(div)
        return soup

    def canonicalize_internal_url(self, url, is_link=True):
        if url.endswith('/print'):
            url = url.rpartition('/')[0]
        return BasicNewsRecipe.canonicalize_internal_url(self, url, is_link=is_link)
